Obesity remains a serious health problem and it is no secret that many people want to lose weight. Behavioral economists typically argue that “nudges” help individuals with various decisionmaking flaws to live longer, healthier, and better lives. In an article in the new issue of Regulation, Michael L. Marlow discusses how nudging by government differs from nudging by markets, and explains why market nudging is the more promising avenue for helping citizens to lose weight.

Two long wars, chronic deficits, the financial crisis, the costly drug war, the growth of executive power under Presidents Bush and Obama, and the revelations about NSA abuses, have given rise to a growing libertarian movement in our country – with a greater focus on individual liberty and less government power. David Boaz’s newly released The Libertarian Mind is a comprehensive guide to the history, philosophy, and growth of the libertarian movement, with incisive analyses of today’s most pressing issues and policies.

Here are some excerpts from the article, starting with his perception of my view on the appropriate size of government, presumably culled from this blog post.

Daniel J. Mitchell of the libertarian Cato Institute posted a blog entry with the provocative title: “Why Is Obama Trying to Make America More Like Sweden when Swedes Are Trying to Be Less Like Sweden?” Good question! When you put it that way, it does seem pretty perverse. …Here’s what the world looks like to the Cato Institute… Don’t worry about exactly how we’re quantifying these things. The point is just this: according to the chart, the more Swedish you are, the worse off your country is. The Swedes, no fools, have figured this out and are launching their northwestward climb toward free-market prosperity.

I confess that he presents a clever and amusing caricature of my views.

My ideal world of small government and free markets would be a Libertopia, whereas total statism could be characterized as the Black Pit of Socialism.

Let me draw the same picture from the point of view of people whose economic views are closer to President Obama’s… This picture gives very different advice about how Swedish we should be. Where do we find peak prosperity? At a point more Swedish than America, but less Swedish than Sweden. If this picture is right, it makes perfect sense for Obama to beef up our welfare state while the Swedes trim theirs down.

He elaborates, emphasizing the importance of nonlinear thinking.

The difference between the two pictures is the difference between linearity and nonlinearity… The Cato curve is a line; the non-Cato curve, the one with the hump in the middle, is not. …thinking nonlinearly is crucial, because not all curves are lines. A moment of reflection will tell you that the real curves of economics look like the second picture, not the first. They’re nonlinear. Mitchell’s reasoning is an example of false linearity—he’s assuming, without coming right out and saying so, that the course of prosperity is described by the line segment in the first picture, in which case Sweden stripping down its social infrastructure means we should do the same. …you know the linear picture is wrong. Some principle more complicated than “More government bad, less government good” is in effect. …Nonlinear thinking means which way you should go depends on where you already are.

Ellenberg then points out, citing the Laffer Curve, that “the folks at Cato used to understand” the importance of nonlinear analysis.

The irony is that economic conservatives like the folks at Cato used to understand this better than anybody. That second picture I drew up there? …I am not the first person to draw it. It’s called the Laffer curve, and it’s played a central role in Republican economics for almost forty years… if the government vacuums up every cent of the wage you’re paid to show up and teach school, or sell hardware, or middle-manage, why bother doing it? Over on the right edge of the graph, people don’t work at all. Or, if they work, they do so in informal economic niches where the tax collector’s hand can’t reach. The government’s revenue is zero… the curve recording the relationship between tax rate and government revenue cannot be a straight line.

So what’s the bottom line? Am I a linear buffoon, as Ellenberg suggests?

Well, it’s possible I’m a buffoon in some regards, but it’s not correct to pigeonhole me as a simple-minded linear thinker. At least not if the debate is about the proper size of government.

I make this self-serving claim for the simple reason that I’m a big proponents of the Rahn Curve, which is …drum roll please… a nonlinear way of looking at the relationship between the size of government and economic performance. And just in case you think I’m prevaricating, here’s a depiction of the Rahn Curve that was excerpted from my video on that specific topic.

P.S. I would argue that both the United States and Sweden are on the downward-sloping portion of the Rahn Curve, which is sort of what Ellenberg displays on his first graph. Had he been more thorough in his research, though, he would have discovered that I think growth is maximized when the public sector consumes about 10 percent of GDP.